I remember going there with our little one a few (or more) years ago.
Weather was terrible so ended up going to a lot of the indoor play areas, one of which was "The Big Sheep".
Son enjoyed it, and he was just small enough that I had to take him on all the slides, so Dad enjoyed it too
Scary thing is we are off to Dublin for a few days in a few weeks time, only slides we will be doing is after I fall on my arse trying to keep up with him in the drinking stakes, bloody students
If you like good beer, go to the Beer Market (or any of Galway Brewery's bars) and have some of their Of Foam And Fury. One of the best beers I've ever had.